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1) Armored cable such as "BX" is not rated for wet conditions and therefore must be replaced if it came into immediate contact with water. "AC or Armored Cable" is commonly referred to as "BX" in the electrical industry.
Per Article 320.12 (Armored Cable, Type AC, Uses Not Permitted) in the National Electrical Code, here is the exact verbiage:
"Type AC cable shall not be used as follows":
(2) Damp or wet conditions
2) Yes, that is correct. Any device such as a wall switch and/or receptacle must also be replaced.
3) Refer to the attached guide published by NEMA for evaluating flooded electrical areas.
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